Apparatus for measuring molten metal temperatures



April 2, 1946. w. R. ZIMMERMIAN APPARATUS FOR MEASURING MOLT EN METAL TEMPERATURES 2 Sheets-Sheet l Filed Sept. 2, 1942 WR.Zz'mmerman April 1946- w. R. ZIMMERMAN 2,397,901

APPARATUS FOR MEASURING MOLTEN METAL TEMPERATURES Filed Sept. 2, 1942 2 Sheets-Sheet 2 V 35 v JZ WR.Zzmmerman Patented Apr. 2, 1946 UNITED sTA'ras PATENT [em APPARATUS FOR MEAsURrNe mom's METAL rnmnnarum s William R. Zimmerman, Ohio: 1 v .7 Application September 2, 194 2' ,Seriali-i 1Claim- (Cl.88 22 This invention relates to apparatus for measuring high temperatures, particularly temperatures occurring in the metal bath of an open hearth furnace during refining or processing of the molten metal.

Metallurgists have long realized the importance of temperature control of the metal bath in an open hearth furnace, especially during the later or refining period of the heat. The temperature of the metal has a direct influence on the final chemical analysis and on the amount of scrap or rejected steel in the finished product.

At the present, the temperature is determined by the observation and judgment of the melter. Temperature readings taken while the steel is being tapped from the furnace into the ladle are too late for any beneficial changes to be made.

This device would enable the furnace operator to obtain an accurate and continuous temperature during the important refining period of the heat of steel.

In the past various methods and devices have been employed for determining the temperatures of the molten metal, and while prior methods and 1 devices would, for a short time, record the temperatures, such prior methods and devices were not entirely satisfactory because of the fact that where a, part ofthe device is projected into the furnace it is subjected to the high. temperature and frequently breaks ofi during the cleaning of the furnace or the charging of the same. It is,

5 212 biz-Fi ur -rami:s cwi gdia rammatical y zarecordericonnectedwithqthej device;

.; and'in'esection, Showing'qthe first step; in themetha J h ving: a: t m e atu e: iincii a nce ansi 10 -1,

t dr ac ordin 311 milent wmoun e Y fi Qmx-xu; L" I 1 '1 i. ,pij I M,

ali'igure'fi is an enlarged vertical; section through-"- the .turnacashowing-the mounting of theyderice;

thereonx i'Figur'etiis a zsideielevation,

partly broken away; 2

odCof; preparing;-the' rerractory:tubelfon mounting ingtliefurnacerr 4;; 5 i Figure 5 is a longitudinal section through the As. i 1 n 'gurei l -isra sectionalrv e taken n lie therefore, an object of this invention to provide I W a temperature recording apparatus wherein the sensitive receiver is disposed exteriorly of the furnace so that no part thereof is in direct contacts with the molten metal or projected into the fur nace.

directly from the metal disposed at the inner end of the tube.

With the foregoing and other objects in view, as may hereinafter more fully appear, the inven-.; -tion consists of the novel construction, combination and arrangement oi! parts, as will be more specifically referred to and as illustrated in the accompanying drawings, wherein are shown several embodiments of the invention, but it is to be understood that changes, variations, and modifications may be resorted to which fall within the scope of the invention, as claimed.

In the drawings:

Figure 1 is a detail front elevation of a furnace A further object of this invention is to provide, a sighting tube which is open at each end so, that the sensitive apparatus, in the form of as pyrometer, will receive light radiation emanatin to the opening ll. The tubular member I 6' const tutes a sight tube for sighting the light emanating from the molten metal and in the formation of the tubular member I6, a wooden plug or core I 8 is disposed in the opening I! and is of a ize substantially less in diameter than the diameter of the opening l'l so that the plastic refractory material maybe placed about the, plug or core l8 

